feat: support v3.0.0 contracts with updatable proposals

[dan13ram]

Upgrade flow looks like this:

1. Show upgrade is available

2. Upgrade button opens Modal for choosing updatable time period

3. Upgrade proposal is created

example: https://testnet-nouns-builder-ksk59jy0y-nouns-builder.vercel.app/dao/sepolia/0xb26f4c39d5e31cf58a51136ac62d29e45a3eb01d/vote/3?tab=details

[vercel]

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Project	Deployment	Actions	Updated (UTC)
testnet-nouns-builder	Ready	Preview	Jun 3, 2026 1:18pm

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
nouns-builder	Ignored		Jun 3, 2026 1:18pm

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